Don't know if this helps, but those numbers seem high.
My 73 B turns about 3800 at 65mph.
My tach is electically motivated from the coil, if yours is, could your coil
may be showing signs of wear? Any "heart murmurs" from the engine tone?
Dan
73 B
-----Original Message-----
From: Carl W. French <cfrench@cybertours.com>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: Wednesday, September 16, 1998 1:09 PM
Subject: RPMs
>I have noticed that my RPMs to a given speed varies. Two days ago I
>could get an indicated 65mph at 4100rpm today I was showing 55mph at
>4000rpm. Two days ago it was a cool dusk setting, today it is sunny and
>in the 70's. This not the first time I have noticed this, any ideas?
>btw, it is a 67B Mk1 with OD.
>
>Carl
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